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    Unhackable metasurface holograms: Security technology can lock information with light color and distance

    February 5, 2026, Categories  Physics, Technology/Electronics

    Schematic of secure holography using a reconfigurable stacked metasurface based on a modular diffractive deep neural network. Each metasurface layer independently reconstructs distinct wavelength-encoded holograms (e.g., ID and QR). When two layers are aligned at a specific interlayer spacing, the system is trained to reveal an encrypted hologram (PW). Because decryption is enabled by the combined choice of wavelength and interlayer spacing as physical decoding keys, the information can be retrieved without electronic computation. This single platform integrates standalone (layer-wise), combinational (cipher), and multi-wavelength functionalities, enabling a photonic security platform for optical encryption and data storage. Credit: POSTECH

    A research team led by Professor Junsuk Rho a...

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    Scientists just mapped the hidden structure holding the universe together

    February 5, 2026, Categories  Astronomy/Space

    The Universe’s Hidden Structure Revealed
    This map shows the Dark Matter distribution in the COSMOS field observed by the Hubble Space Telescope (left) and by the James Webb Space Telescope (right). Dark Matter distribution in the COSMOS field. The overlaid contours mark regions of equal dark-matter density, highlighting where this invisible matter – shown here in a blue color ­– is most strongly concentrated. Credit: Dr. Gavin Leroy/Professor Richard Massey/COSMOS-Webb collaboration

    Scientists have produced the most detailed map ever created of dark matter that runs throughout the Universe, revealing how it has influenced the formation of stars, galaxies, and planets.

    The research, which includes astronomers from Durham University in the UK, provides new insight into how this unseen substance helped draw ordinary matt...

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    Physicists achieve near-zero friction on macroscopic scales

    February 5, 2026, Categories  Physics, Technology/Electronics

    Physicists achieve near-zero friction on macroscopic scales
    Macroscale structural superlubricity at graphite/graphite and graphite/MoS2 interfaces. Credit: Minhao Han et al.

    For the first time, physicists in China have virtually eliminated the friction felt between two surfaces at scales visible to the naked eye. In demonstrating “structural superlubricity,” the team, led by Quanshui Zheng at Tsinghua University, have resolved a long-standing debate surrounding the possibility of the effect. Published in Physical Review Letters, the result could potentially lead to promising new advances in engineering.

    What structural superlubricity promises
    When two objects slide over each other, any roughness on their surfaces will almost inevitably resist the motion, creating the force of friction...

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    Supermassive black holes sit in ‘eye of their own storms,’ studies find

    February 5, 2026, Categories  Astronomy/Space

    Illustration of gigantic black hole surrounded by a disc of gas and a jet of particles coming from both ends.
    An artist’s rendition of the immediate vicinity around the supermassive black hole known as M87*. However, the roiling, superhot gases around these black holes extend much further than seen in this visualization. Two new studies give us new insight into the regions around these black holes and how they influence their surrounding galaxies.Illustration by S. Dagnello (NRAO/AUI/NSF)

    Gigantic black holes lurk at the center of virtually every galaxy, including ours, but we’ve lacked a precise picture of what impact they have on their surroundings...

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